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I need to carry a lot of stuff home for a college-age relative, and I'm flying Southwest.

I know that in practice airlines will let you fly with a bag that weighs a smidge over 50 lbs.

The mass-produced trunks this student has measure 62.5 inches according to online specifications (that I could print out and carry with me). The maximum size SWA allows is 62", with a $75 oversize charge above that.

Of course, we'll be sure to keep the weight a couple of pounds under 50 lbs.

Should I take one up to the airport to check it out? What do you think?

"The mass-produced trunks this student has measure 62.5 inches according to online specifications " - In my experience the measurements quoted by manufacturers/retailers are frequently internal dimensions and exclude handles/wheels which have to be taken into account in the airlines size limits.

As long as the 62.5 inches includes any wheels/handles you'll probably be ok as long as you don't get an over zealous check in agent.

Whilst I generally have little sympathy for those who exceed baggage limits I don't think an extra 0.5 inch makes a great deal of difference although I do accept that it's over limit and technically it doesn't matter whether it's 0.5 inch or 5 inches.

There has to be a limit somewhere. Wherever they put it, someone will try to bring a bag 1/2" too big. If it is too big, you run the risk of being charged the over-size fee. Most US airlines seem pretty lenient, but I guess it is up to you. Worst case is you pay the over-size fee.

Just as a note, European airlines are a lot stricter about bag size and weight. When traveling in Europe, they regularly weigh my bag and check the size to make sure it is OK.

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